1）在否定句或疑问句中可用so… as。
　　　He cannot run so/as fast as you.

2）当as… as 中间有名词时采用以下格式。
　　　 as +形容词+ a +单数名词
　　　 as + many/much +名词
　　 This is as good an example as the other is.
　　 I can carry as much paper as you can..

3）用表示倍数的词或其他程度副词做修饰语时，放在as的前面。
　　This room is twice as big as that one.
　　Your room is the same size as mine.　　

4) 倍数+ as + adj. + as　<=> 倍数+ then + of
　　This bridge is three times as long as that one.
　　This bridge is three times the length¹ of that one.
　　Your room is twice as large as mine.
　　Your room is twice the size of mine.

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